What I find strange about this image is that the head disappears on the ground the moment the zombie’s neck is out of camera, as if it is removed by occlusion culling from the zombie position instead of where it actually is. It also appears to briefly cast a long shadow which might suggest the stretch is actually a mesh? Debugging the zombie case might be more difficult than the trees since the problem can also be caused by the decapitation mechanic or bones, so the best lead here are the trees which are simpler static meshes.
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